Ore-concentrating-table launder.



- UNITED STATES PATENT i Orricne JOHN O. `BARDILL, OF DESLOGF., MISSOURI.

ORE-CONCENTRATING-TBLE LAUNDER.

SEECIFIGATION forming part of Letters Patent No. 720,774, dated. February 17, 1903.

Application iiled October 27. 1902. Serial No. 129,003. (No model.)

Z'o @ZZ whom, t may corr/cern:

Beit known that I, .IOH O. BARDILL, a citizen of the United States, residing at Desloge, in the county of St. Francois and State of Missouri, have invented certain new and useful Improvements in Ore-Goncentrating-Table Launders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a launder for receiving and separating mineral from ore-pulp, the object of the invention being to provide a construction in which the mineral may be separated from the ore-pulp and discharged from the concentrating-table in a practically clean condition and the middlings may be graded and discharged separately from the tailings of the pulp and also in which the grading of the various component parte of the pulp may in an expeditious manner be governed to a nicety, so that each may be conducted away from the concentrating table wit-hout intermiXture or combination.

My invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a top or plan view of a concen trating-table and mylaunder associated therewith, the edges of the table adjacent to the launder being broken away to afford a clear View of the launder. Fig. II is a section taken on line II II, Fig. I, through one of the trough-arms of the launder. Fig. III is a section taken on line III III, Fig. I, through the secondlaunder tro ugh-arm. Fig. IV is a view illustrating a plug by which the passage-ways leading from the launder-troughs may be controlled. Fig. V is a vertical cross-section taken on line V V, Fig. III.

1 designates a concentrating-table, and2 a feed-box :from which the ore-pulp is delivered onto the table for concentration. This table and feed-box form no part of my invention and are illustrated merely for the purpose of showing the application of my launder. The table is designed to receive a low of water directed thereonto in the usual mannerfroln a suitable wash-water box. (Not shown.)

3 designates the end trough arm of my launder, which extends beneath the forward cud of the concentrating-table 1 to receive the material passed from the table over that end in the longitudinal reciproeation of the table in the usual manner while acted upon by the wash-water flowing transversely across the table.

4: is the front trough-arm of the launder, which extends beneath the forward edge of the table from a junction with the arm 3. At

Vthe inner end of the trough-arm 3 is a conduit 5, which leads to a mineral-conveying pipe 7, (see Fig.'III,) through which the free mineral is conducted from the trough-arm after entering thereinto from the rear portion of the concentrating-table.

8 is a shelf located in the trough 3 above the conduit 5 and extending from the partition l() at the inner termination of the trougharm 3. Inthe shelf -8 is an orifice 9, andin the partition 10 above the shelf is an orifice 11. (See Figs. II and III.)

12 is an adjustable slide trough vloosely seated on the end trough 3 and adapted to be moved along said trough to varying positions, with its forward end over-hanging the shelf 8, this trough serving to direct the higher grade of'middlings onto said shelf S, and the expanse of table from which it receives discharge is governed by the position of the shelf forwardly or hackwardly on the end trougharm. At the inner end of the front trough- 'arm e, which receives the tailings or gangue discharged over the outer portion of the front edge'of the table, is a conduit 13, that has communication with a tailings-conveying pipe 14. (See Figs. IIA and III.) Above the conduit 13 is a shelf 15, that contains an orifice 16 and leads from the vertical partition arrangedrat right angles to the partition 10 at the inner end of the end trough-arm 3. The partition 1-7 contains an orifice 18, located above the inner end of the shelf 15. (See Figs. II and III.)

A is a compartment located at the junction of the end and front troughs 3 and et and into which communication from the troughs is provided by the orifices 11 and 1S in the partitions 10 and 17. i Y

19 is a middlings-conveying pipe leading from the compartment A.

20 designates an adjustable slide-trough loosely mounted on the front trough 4 and adapted to have its forward end overhang the IOO shelf 15, as seen in Fig. Il. This slide-trough 20 is adapted to receive the low grades of middlings which pass over the front edge of the concentrating-table, and it may be shifted on the front trough to extend a more or less degree over the shelf 15 in order to receive material from a greater or less expanse of the table, according to requirement necessitated to catch the middlings discharged without receiving the tailings which are washed from the table beyond the outer end of said slidetrough.

In the practical use of my launder the table over which the ore-pulp is passed is reciprocated in the usual manner, and during such reciprocation and the usual washing action to which the pulp is subjected the component parts of the pulp are delivered to the launder as follows: The free mineral passes longitudinally off the table and is discharged into the rear or outer end of the end trough 3 and flows downwardly through said trough to escape through the conveying-pipe 7. rlhe tailings are Washed forwardly across the table and enter the outer end of the trough 4 and flow to the conduit 13 and therefrom into the conveying-pipe 14. In treating ore-pulp containing a valuable percentage of middlings of both high and low grades which it is desired to save I close the orifices 9 and 16, located, respectively, in the shelves S and 15, by inserting thereinto plugs, such as illustrated by 2l (see Fig. IV) and shown in dotted lines, Figs. Il and III. When the plugs are inserted, as stated, the middlings are discharged froin the table onto the shelves 8 and 15 and the slide-troughs 12 and 20, that lead thereto. As a consequence the middlings deposited on said shelves are delivered therefrom through the orifices 11 and 18 into the compartment A and are conducted therefrom through the conveying-pipe 19. (See Fig. II.) In the case of treatment of orepulp containing only high-grade middlings I close the orifice 18 and leave the orifice 16 in the shelf 15 open, and thereby permit all of the material passed over the forward part of the table in the vicinity of the shelf 15 to dow through said orifice 16 and discharge With the tailings. In treating ore-pulp of a rich nature and free of high-grade middlings I provide for the discharge of the mineral delivered onto the shelf 8 of the slide-trough 12, leading thereto, by closing the orifice 11, leading into the chamber A, and leave the orifice 9 in the shelf S open, so that the mineralldelivered to said shelf will pass directly therethrough and enter the conduit 5, to be' discharged therefrom through the conveyingpipe 7 With the mineral that enters the rear end of the end trough 3.

In the bottom of the compartment A is an orifice 22, that is designed to be closed by a plug 2l or may be opened to permit the escape of the middlings from said compartment into the conduit 13 of the front or tailings trough 4. At certain times in the use of the launder it may be desirable to divert the middlings into the tailings to avoid cessation of operation of the concentrating-table, this being more liable to be the case in the treatment of the lower grades of ores. The middlings of ore-pulp are usually returned to the concentrating-table after being discharged therefrom, centrifugal pumps being utilized for such return. In the event of the pumps becoming out of order and requiring repairs it would be necessary to stop the operation of the concentrating-table unless the middlings were diverted from their usual discharge in the manner rendered possible by the opening of the orifice 22.

I claim as my invention- 1. The combination With a concentratingtable of a launder comprising a pair of trougharms provided with mineral and tailings receiving conduits and a middlings-receiving compartment, apertured shelves located in said trough-arms onto which a portion of the ksubstance entering the laundermay be conducted either into said middlings-compartment or passed therethough into said conduits, and means for controlling the flow of the substance from said shelves, substantially as set forth.

2. The combination with a concentratingtable, ofalaunder comprisingapair of trougharms extending at angles from a juncture with each other and provided With mineral and tailings receiving conduits and a middlingsreceiving compartment located at the junction of said trough-arms, apertured shelves located in said trough-arms onto which a portion of the substance entering the launder may be conducted into either said middlingscompartment or passed therethrough into said conduits, and means for controlling the ow of the substance from said shelves, substantially as set forth.

3. The combination with a concentratingtable of a launder comprising a pair of trougharms provided with mineral and tailings receiving conduits and a middlings-receiving compartment, apertured shelves located in said trough-arms onto which a portion of the substance entering the launder may be conducted into either said middlings-compartment or passed therethrough into said conduits, means for controlling the flow of the substance from said shelves, and slide-troughs mounted on said trough arms above said shelves, said slide-troughs being adapted to receive a portion of the substance passing to the launder and directed onto said shelves, substantially as set forth.

JOHN O. BARDILL.

In presence of- THEo. L. BUNTE, Jr., GEO. H. EDWARDS.

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